Change-speed gearing.



W. H. PARSONS. CHANGE SPEED GEARING. APPLICATION rmm MAR. so, 1910.

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WILLIAM H. PARSONS, OF MIDDLETOWN, CALIFORNIA.

CHANGE-SPEED GEARING.

Specification of Letters Patent.

Patented May 9, 1911.

Application filed March 30, 1910. Serial No. 552,312.

To all whom it may concern:

Be it known that I, WILLIAM H. PARSONS, citizen of the United States,residing at Middletown, in the county of Lake and State of California,have invented new and useful Improvements in Change- Speed Gearing forMotor-Cycles, of which the following is a specification.

This invention relates to a change speed gearing for motor cycles. I

The object of this invention is to provide a two-speed gearing which isadapted to be applied to motor cycles and other vehicles, and is sodesigned and arranged that either the high or low speed may be adjustedso as to engage with the driving mechanism.

Another object is to provide a clutch which will permit of changingspeed while the machine is in motion, and to also provide means forassisting the starting of the engine or the slow speed gears.

The invention consists of the parts and the construction andcombinations of parts as hereinafter more fully described and claimed,having reference to the accompanying drawings, in which Figure 1 is aside view of the invention as applied. Fig. 2 is a vertical section ofthe friction clutch and change speed mechanism. Fig. 3 is a detail inside elevation of the friction clutch. Fig. 4 is a detail of the pawland ratchet drive. Fig. 5 is a detail of the operating handle. Fig. 6 isa diagram illustrating the belt drive.

In the drawings A represents a motor cycle having an engine 2 mountedthereon.

3 is the drive shaft of the engine 2, which carries a pulley 4 on itsouter end. A belt 5 passes around the drive pulley 4, thence back overdirection pulleys 6, 6 suitably mounted on the frame of the cycle, andthence passes around a pulley wheel 7 located in close proximity to therear wheel B of the cycle A. This pulley wheel 7 has an elongated hollowhub 8 on the outer ends of which are formed raceways for ball bearings 9which bear upon similar raceways formed on the peripheries of the hubsof clutch rims 10, 11. These clutch rims 10, 11 are disposed on eachside of the belt pulley 7 and form the rims against which the straps 12,13 of the clutches are adapt ed to be frictionally engaged, as laterdescribed. The hub of the clutch rim 10 is keyed on a tubular shaft 14,and the clutch rim 11 is mounted loosely thereon, the hub of the latterrim 11 being secured to a pinion 15 also loose on the shaft 14. Thepinion 15 meshes with a gear 16 mounted on a shaft 17. A pinion 18 onthe shaft 17 meshes with a gear 19 loosely mounted on the shaft 14. Aseries of pawls 20 on the gear 19 engage with the teeth of an internalratchet wheel 21 which is keyed on the shaft 14, as shown in Fig. 4.

A pinion 38 is mounted on the inner end of the shaft 14 and is inconstant engagement with a circular rack 39 mounted on the rear wheel Bof the cycle A to drive the latter as the shaft 14 is rotated, as laterdescribed.

A rod 22 extends lon itudinally within the tubular shaft 14 am isadapted to be reciprocated therein by means of a bell crank 23, one endof which engages the annular groove on the outer end of the rod 22. Theother end of the bell crank 23 is connected to a crank arm 24 on a shaft25, which extends horizontally toward the forward end of the cycle A. Acrank 26 on the end of the shaft 25 connects with a curved rod 27 whichin turn is connected to an arm 28 on the left handle 29 of the handlebars 30. The handle 29 is pivotally mounted on the bar 30 so as topermit of its being turned from side to side in such manner as totransmit a rocking motion to the bell crank 23, through the rod 27 andshaft 25 and thus reciprocate the rod 22 in the tubular shaft 14.

The inner end of the rod 22 is provided with laterally extending pins 31which project through longitudinally disposed slots in the shaft 14 andengage a sleeve 32 loose on the shaft 14. A divided cam roller 33mounted loose on the shaft 14 houses the sleeve 32 and is engagedthereby in such manner as to be moved back and forth on the shaft 14 asthe rod 22 is reciprocated; the sleeve 32 permitting of a revolvingmovement of the shaft 14 independent of the cam roller 33.

The periphery of the cam roller 33 is convexed, as shown in Fig. 2, andis adapted to engage a curved rocking cam lever 34, which extendscrosswise of the roller 33 and is pivoted at its center to the hub 8 ofthe pulley wheel 7, the hub being slotted lengthwise to accommodate thelever 34. The outer ends of the rocking cam lever 34 are linked to bellcrank levers 3536 mounted on the pulley 7 and connecting with the looseends of the strap clutches 12, 13 respectively, rigidly mounted at oneend to the pulley 7, as shown at 37 in Fig. 3;

there being one of these straps 12 on one side of the web of pulley 7,and the other strap 13 on the other side, corresponding with the drums10, 11. These straps 12, 13 are out of contact with the rims or drums10, 11 when the cam roller 33 is in the central position shown in Fig.2; but when the roller 33 is moved, for instance, to the left of Fig. 2,the opposite end of the lever 34 is pulled down, throwing itscorresponding strap 13 into frictional engagement with its correspondingrim or drum 11; and vice versa the opposite movement of the cam roller33 rocks the cam lever 34 in the opposite direction and connects thehigh speed drum 10 to the pulley, 7.

From the foregoing it will be seen that with the parts in the neutralposition shown in Fig. 2, with neither clutch in operative position, thepulley wheel 7 and the shaft 14 are free to revolve independent of eachother, and in this position permit of the machine being moved withoutoperating the engine through the belt pulley 7 or permit of the enginerunning without imparting motion to the cycle.

The operation of the invention is as follows: In starting the machine onlevel ground, the parts being in the neutral position shown in Fig. 2,the high speed clutch, consisting of the drum or rim 10 and strap 12 isfirst thrown in. This is accomplished by operating the handle 29 in suchmanner as to rock the bell crank 23 in the direction of the arrows, Fig.2, and thus move the rod 22 so as to slide the cam roller 33 backward onthe shaft 14. This action causes the lever 34 to rock on its pivot, oneend being pressed upward by the roller 33, the other moving in I adownward direction.

This downward movement of the lever 34 pulls upon the bell crank 35 soas to expand the strap 12 and cause it to grip the rim 10. When this hasoccurred, the pulley wheel 7 is clutched directly to the shaft 14, asthe hub of the rim 10 is keyed thereon, as before mentioned, and theengine 2 is then connected to the drive wheel B on the high speed. Theop erator then moves the machine forward on the ground so as to rotatethe drive wheel B, which rotates the shaft 14 and the belt pulley 7through the clutch 10, 12, so as to rotate the crank shaft 3 of theengine 2 and start the latter in the well known manner.

To throw in the slow speed gears, the bell crank 25 is rocked in theopposite direction so as to slide the roller 33 to the opposite end ofthe lever 34 and thus throw the strap 13 into engagement with the clutchrim 11,

and release the strap 12 from the rim 10. In

this position the engine 2 will be connected to the drive wheel Bthrough the belt pulley in constant engagement with the ratchet teethand thus rotate the shaft 14 at slow speed. The ratchet disk21 beingkeyed to the shaft 14 also rotates therewith when the latter is revolvedon the high speed, in which case the gear 19 stands still and theratchet 21 rides free under the pawls 20.

As a means of enabling the operator to start the machine on the slowspeed, as would be necessary in starting on an upward grade, a pinion 40is provided which meshes with the gear 16, and is mounted on a shaft 41to which acrank (not shown) may be attached. The slow speed clutch beingthrown in, the operator rotates the pinion 40 by means of a crank, thusdriving the shaft 41 through the train of gears before described, tomove the machine ahead, and at the same time rotates the belt pulley 7so as to start the engine in the well known manner.

Having thus described my invention, what I claim and desire to secure byLetters-Patent, is:

1. In a transmission mechanism, a driven shaft, a pulley loose on saidshaft, a drum fiXed to the shaft on one side of the pulley, and a drumloose on the shaft on the other side of the pulley, driving connectionsbetween the loose drum and said shaft, and.

means for locking either drum to the pulley, said last named meansincluding'a cam member shiftable lengthwise of the shaft.

2. In a transmission mechanism, a driven shaft, a pulley loose on saidshaft, a drum fixed to the shaft on one side of the pulley, and a drumloose on the shaft on the other side of the pulley, driving connectionsbetween the loose drum and said shaft, means for locking either drum tothe pulley, said last namedmeans including a cam member shiftablelengthwise of the shaft, and a cam lever engageable by said member withfriction means operated by each end of the lever engaging with one ofsaid drums.

3. In a transmission mechanism, a hollow driven shaft, a loose pulleythereon, a friction drum mounted on the shaft on each side of thepulley, and means operated through the hollow shaft for connectingeither drum to the pulley.

4. In a transmission mechanism, a hollow driven shaft, a loose pulleythereon, a friction drum mounted on the shaft on each side of thepulley, means operated through the hollow shaft for connecting eitherdrum to the pulley, said last named means including In testimony whereofI have hereunto set a roller loosely mounted on the shaft and my hand inthe presence of two subscribing slidable thereon, a cam lever pivoted inthe witnesses.

pulley and engageable by the roller, and WILLIAM H. PARSONS. frictionstraps connected with the pulley and Witnesses:

with the ends of said lever and engageable I'IAMLIN W. HERRICK,

with one of said drums. CHAS. W. YOUNG.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

